Feed device for lathes.



No. 863,681. PATENTED AUG. 20, 1907.

' J. N. WARNER.

FEED DEVICE FOR LATHES. APPLIOATION FILED SEPT. s, 1905.

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J. N. WARNER. FEED DEVICE POR LATHES.

`APPLIMTION FILED sBPT.5,1so5.'

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PATENTED AUG. 20, 1907.

J. N. WARNER. FEED DEVICE POR LATHES.

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JOSEPH N. WARNER, OF sT. PAUL, MINNESOTA.

, EEED DEVICE EOE. LATHEs.

Specication' of Letters Patent. v

Patented Aug. 20, 1907.-

Application led September 5,'l`905. Serial No. 277,058.

To all whomt't may concern:

Be it known that I, JOSEPH N. WARNER, of St. Paul,

` Ramsey county, Minnesota, have invented certain new and useful Improvements in Feed Devices for Lathes,l of which the following is a specification.

My invention relates to lathes and particularly to a pneumatic and hydraulic device for 'controlling the feed of the turret carriage and regulating the. movement of the same. The object o my invention is to provide means within control oi the lathe operator for easily and quickly regulating or controlling the travel oi the carriage, to the end that considerable time may be saved in the operation o the lathe and the labor incident to such operation greatly reduced.

The invention consists generally in providing an elastic fluid motor cylinder in connection with the turret carriage and inelastic fluid regulating' cylinders also connected with said carriage for regulating the disspecification, Figure 1 is a plan view of a turret lathey with my invention applied thereto. elevation of the same. illustrating the position oi the oil and air cylinders and their valves, and the pipes connecting them. Fig. 4

Fig. 2 is a side is a longitudinal sectional view through the air cylinder taken on the section line x-x of Fig 5 looking in the directiomof the arrow. Fig. 5 is a sectional view on the line y-y of Fig. 4. Figs. 6 and 7 are detail views o the oil valve which controls the passage oi oil from.

one side oi the oil cylinder piston to the other. Fig. 8 is a detail sectional view illustrating a device for maintaining a constant supply ofA oil in the cylinders. Fig. 9 is a detail plan view of the'air valve showing its connections with the oil valve and with its cylinder.

Fig. 10 is a side elevation of the same. Fig. 11 is avertical sectional view on the line z-'-z of Fig. 12.v Fig. 12 is a sectional view on the line w-w of Fig. 11 showing I the intake closed and both ends oi the cylinder opento the exhaust. Fig. 13 is a similar view showing the air intake port open and one end o the cylinder open to the exhaust. Fig. 14 is a detail sectional view illustrating the clamp device for supporting the air cylinder On the lathe. Fig. 15 is adetail view illustrating the locking device for securing the collar on the oil valve spindle.

In the drawing, 2 represents the bed or base of an Ordinary'turret lathe, 3 the cone pulley and 4 the turret carriage supporting the turret 5. The carriage is 'movable in a way 6 provided in the top of the bed and extending lengthwise thereof, and has the usual hand wheel 7 for moving the carriage back and forth byhand.

Fig. 3 is a detail plan view The carriage in alarge turret lathe is heavy and cum-y bersome 'and lathe operators have found the work of moving it by hand back and forth on the bed not only a very laborious operation but also 4one requiring considerable time. To avoid this objection to the operation of thistype'of lathe, I-pro`vide a motor cylinder 8,

preferably secured to one sidefof the lathebed by a clamp. i

the said pistons respectively with a bracket 21 which is secured to one side oi the turret carriage 4. (See Figs. 1 and 3). l

The piston rod 19 is preferably formed of tubing, and its piston 'I6 has a hole extending therethrough, and a guide rod 22 extends through the said rod and piston and the cylinder 13, and is secured at one end in a bracket 23 on the bed of the lathe and at the other end in the head of the primary cylinder 13'. This rod'22 acts as a guide and support for the bracket 21 and the pistons and cylinders connected therewith, and allows'a, free reciprocation of Vthe same when the carriage is operated. It also supports the rod 19 and allows the use of a smaller tubing than would ordinarily berequired. The oil flows into one end `only ofthe secondary cylinder, andthe capacity of the primary oil cylinder on the right of its piston is substantially equal to the capacity of both the primary and secondary cylinders on the let oi their pistons. By providing the secondary ,cylinder and admitting oil to one end only l am able to offset the loss in the capacity` oi one end of the primary cylinder caused bythe presence of the rod 19, and obtain oil receiving chambers of equal capacity upon opposite sides of the primary oil cylinder piston and insure a regular uniform lmovement of air inlet port 28 communicating with a pipe 29, which' is provided with a reducing valve 30 and communicates f controls the lfiow of air to the air cylinder.

34 with the air inlet port 28. Air inletl ports 35 and 36 are provided leading through pipes 37 and`38 to the ends of the aircylinder 8 to deliver`the air thereto. upon each side of the air cylinder piston. A port 39 leads from the groove 33 through the upper surface of the valve 27, and forms a y communicating passage from the air inlet duct 34 to the chamber 40 above the rotary valve. This allows the pressure of air to be equalized above and below the valve to balance the same and allow it to be easily operated.

A stem 41 is provided on the valve 27 extending up through the top 26 and the shelf 24, and isprovided with an operating handle 42 and an indicator or pointer 43 which travels over a graduated plate 44 when the valve is rotated, the graduations representing different positions of the valve and enabling the operator to readily determine the location of the valves with respect to the ports leading to the cylinders. For instance, in the position of the pointer shown in F ig. 3 both ends of the air cylinder` are opento the exhaust, and the oil valve is open to allow the free passage of the oil. In Fig. 13 the air valve is set to allow the air to flow into one end of the cylinder and exhaust from the other end.

The oil valve comprises a casing 45 within 'which a slide valve 4G is arranged having stems 47 and 48 on each end. Diamond-shaped ports 48 are provided in the opposite side walls of the casing 45 communicating with pipes 49 and 50 which lead to the ends of the oil cylinder 13, the pipe 49 having a branch 51 communieating with onelend of the secondary cylinder 14, the opposite end of said cylinder being open to theair. These ports 48 allow the flow of oil from one end of the primary oil cylinder to its other end and the corresponding ond of the oil cylinder to be easily and accurately controlled. The oil valve is shown wide open in Fig. 6, and upon moving it toward the right the fiow of oil will be checkedV and finally entirely cut off. If the valve is moved in either direction from the closed yposition shown in Fig. 9, the fiow of dil will begin and gradually increase as the valve is moved until it reaches the wide open adjustment of Fig. 6. The movement of this valve, therefore, positively controls the flow of oil through the valve and the speed of the carriage, the 4motive power, or air, being supplied to the cylinder by the operation of the rotary valve. f 1f a slow speed is desired, the slide valve is only partially opened, and by moving the valve back and forth the flow of oil can be accurately controlled and the speed of the carriage easily regulated. The stem 48 is squared at the end and is slidable in a guide 52, and a link 53 pivotally connects the said stem with an arm 54 secured on the` valve stem 41 and movable with said stem when the valve is rotated. The operation, therefore, of the single lever 42 imparts a reciprocating movement to the slide valve 46 to open or close the diamond-shaped portsx and allow the passage of the oil from one end of the oil cylinder to the other, and also I amthus able to con'trolboth valves with one lever.

To maintain a uniform supply of oil in the cylinders md make up for the loss by leakage, I provide a cylinder 55 connected with the pipes 49 and 50 by a pipe 56 having valves 57 `normally closed by springs 58,. but

adapted to yield upwardly and allow the passage of the oil to the oil cylinders when the supply has fallen below a predetermined volume. A piston 59 is provided in the cylinder 55 having aired 60 and a handle 61` and a spring 62 is arranged between the piston and the end f of the cylinder and normally tends to press said piston away from said end and force the oil up through the valves 57 and maintain a uniform supply in the oil cylinders. IA screw device 63 in said end is adapted to be turned down against the stem to lock it in any desired position in the cylinder head. When this screw is removed from contact with the piston stem, the spring 62 will-move the piston against the body of oil in the cylinder. The cylinder is supplied with oil throughy a hole 64 having a suitable plug 65.

The 'controlling device may be used without the secondary cylinderv if preferred by simply disconnecting -the piston rod 20 from the bracket 21 and removing the cylinder.

It is desirable in an apparatus of this kind to provide means for closing the slide valve 46 automatically tov stopthe carriage when it reaches a certain predetermined point on the bed of the lathe. I therefore provide arod 66 slidably supported on thelathe bed and' having stops 67 secured thereon at intervals in the path 0f a set screw 67 carried by an arm 68 on the lathe car-v riage. An arm 69 is pivoted at one end on the bed of the machine, and has a collar 70 at its opposite end loosely mounted on the stem 47, between which collar and stops 71 on said vstem springs 72 are arranged. When the arm 68 strikes one of the stops onthe rod 66, the said rod will be moved longitudinally to move and center the slide valve and close `both oil ports and arrest further movement of the carriage. The springs 72 center the collar 76 on the stem 47 and allow the stem to be moved a suicient distance by rotating the air valve, to open the oil ports and permit the carriage to be moved in the opposite direction. When it is desired to operate the carriage entirely by hand the rotary valve isset in the' position shown in Figs', 3 and 12, and both ends of the air cylinder will be open to the exhaust and the oil valve will be wide open, allowing the oil to flow freely from one end of the primary oil cylinder to the other.

It is sometimes desirable, where the pressure of the air is not uniform, to provide means for locking the collar 70 on the valve spindle. I therefore mount a pin 73 in said collar and provide avflat surface 74 on the spindle 47 to be engaged by the end of said pin. A spring 75 normally holds the pinout of engagement with said surface. A cam lever 76 is pivoted in said collarand'is adapted-to engage the outer end of the pin 73 and force it'into contact with the spindle 47 against the tension of the spring 75 whenever it is desired to lock the collar on the spindle. This 'lever 76 is within convenient reach yof the lathe attendant and can be easily and quickly thrown to its locked or unlocked position. When this collar -is locked on the spindle, the spring 72 will yield sufficiently to allow movement o the oil valve.

I have shown and described this controlling apparatus in connection with a lathe bed and carriage but do not vwish to conne myself entirely to that use as it is applicable to planers and other machines having a reciprocating carriage.

By having the pistons project at one end only` of the cylinders the apparatus can be operated in a compact space and at no time during the` operation of the device will it be necessary to have a moving part ofthe controlling mechanism projected beyond the trame of the -machine on which it is mounted. .The apparatus is hence particularly adapted as a controller Where machines having carriages to be controlled are arranged close together on a shop or factory ilooror where the space by reason of the particular use of the machine is necessarily very limited.

I claim as my invention:

1. The combination, with a machine bed and carriage, of

an elastic fluid cylinder 4having its piston connected with said carriage, an inelastic fluid cylinder also having itspiston connected with said carriage, elastic uid pipes having a suitable valve connected with said elastic uld cylinder, inelastic fluid pipes connected with the ends of said inelastic iluid cylinder and having a suitable valve arranged to control the flow of fluid from one end of said inelastic iuid cylinder to` the.other,' and mechanism ar-` ranged to be actuated by said carriage for automatically' closing said inelastic fluid valve to shut oft the iiow of uid therethrough and stop said carriage, substantially as` described.

2. The combination, with a carriage, of a motor cylinder having a piston connected with said carriage, primary and secondary regulating cylinders having their pistons also connected with said carriage, an elastic fluid supply connected with said motor cylinder and .an inelas'tic fluid supply connected with h oth endslyof saidprimary regulating cylinder and with one end of said secondary regulating cylinder, the piston rods of said primary and secondary regulating cylinders being on one side only. of their pistons and the capacity of said primary regulating cylinder on one side of its piston being substantially equal to its capacity on the other side -o its piston, plus the capacity of the corresponding end of said 'secondary cylinder, and means for controlling the dow of fluids to said' motor and regulating cylinders.

3. The combination, with a machine bed and carriage, of a motor cylinder provided with a piston and arranged to move said carriage, a regulating Vcylinder having a piston arranged to be moved in said cylinder by said carriage, vthe rods lot said motor cylinders 'and said regulating cylinder pistons projecting beyond one end only of their cylinders, an elastic uid supply connected with said motor cylinder, an inelastic uid supply connected with both ends -of said regulating cylinder, a reservoir cylinder having a Spring pressed plunger and a pipe and check valve connection with said regulating cylinder, whereby upon the removal of said check 'valve, said plunger w'lll yieldunder pressure of the inelastic uid and allow a suicient quantity to how into saidl reservoir to compensate for the difference 'n capacity of saidregulating cylinder on opposite sides. of its piston, means for con/trolling the iiow of fluid to sa-id motor cylinder`and means for controlling the iiow of fluid from one end of said regulating cylinder-to the other, substantially as described.

30th day of August 1905.

JOSEPH N. WARNER.

Witnesses:

RICHARD PAUL, D. G. HANsoN. 

